With regard to Fe-Cr-Ni ternary alloys, the corrosion tests by immersion and by polarization were carried out in maleic acid solutions of various concentrations.
The results are summarized as follows:
(1) Heat treatment produces an important effect on the corrosion resistance of the alloys.
(2) Austenitic single phase alloys have excellent corrosion resistance. But when the alloys contain ferritic or martensitic phase and also σ phase, the anodic dissolution, passivation current density and Cr⁶⁺ ion dissolution increase remarkably.
(3) The rise of temperature is found to increase the anodic dissolution.
(4) The corrosion resistance of austenitic Fe-Cr-Ni alloys is inferior to that of 25% Cr-Fe alloy of ordered lattice.

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Stray current corrosion is liable to occur on steel piles buried near electric railroad. To prevent such corrosion several field experiments were carried out at Yakô bridge, and an electric drainage system was applied with careful consideration to decrease the mutual interference between this system and other underground pipe lines.

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